To all whom it may concern



4@uitrit gioire @stmt @fitta IMPROVEMENT IN ROILsR-rtns entsinne.,

ROBERT .KINGOF BROOKLYN, NRW YORK, iissIeNOR To. T. rROssRR-,a SON, OrNRW YORK O-ITY.

Letters Patent No. 60,013, dated November 27, 1866.

SPECIFICATION- TQ ALL WHOM IT MAY CONGERN:

Be it known that I, ROBERT KING, of Brooklyn, in the county of Kings,and State of New York, have invented `a certain new 'and isefu'lImprovement on Helical Wire Brushes; of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawing, forming part of this speccation, and in Whichi Figure 1represents a longitudinal view O''` a helical wire brush, constructedaccording to my improvement; and,

Figure 2, a transverse section thereof, taken as indicated by the -line:v :vin tig.` 1. Like letters refer to like parts in both figures. yHelical wire brushes, or'flue-brushes, as they are sometimes called fromtheir use in cleaningouttubular boiler fines, have usually beenconstructed of steel wires of spring temper, made l'at at their ends, toact a's Scrapers or cutters, and arranged in the form of a helix round atwisted wire stock composed'ot` two 6r more strands, and serving toreceive'between them and hold midwayof theirrlength the steel` wires ofthe helix'. An eye at one end of the stockiand screw-shank at theopposite end servewby means of a rope and rod orlrods, to

work and pass the brush through the tube or iiue. Such brushes, however;have been defective in the arrangement of the wire's of the helix, whichshould have i'ree open spaces between each other` at their working endsthat require to be flexible, while theinterior portion of the helixaround the stock should be close packed by the wires, so' as to form armer hold of the latter. This cannot be effected, however, or butimperfectly so, b y the present mode of construction; that is, byholding the several wires to or in the stock midway `of their length,and so that each twoadjacent ones project to an equal extent fromopposite sides of the stock, as to leave suf-v ficient width of spacesbetween the wires at their working ends does not admit of sufficientlyclose packing of them around the core or stock to give thema steadyholdv the one upon the other, and distributes the ilexibility toogenerally .throughout their length, while to arrange them in closerconnection round the core brings their working ends too near each otherto operatezwith the desired elect. This diihculty, however, my inventionobviates; and it consists in arranging the brush-wires so that theyprotrude further from or on one side of the stock than on the oppositeside, whereby a close packing of the wires is obtained at the centrearound the core, and an open or free space left between them at theirworking ends. Y For the information of others whom it may concern, Iwill proceed to describe my invention, with reference to theaccompanying drawing, in whichj i i A is the core, or stock, formed oftwisted wire, or strands, in `the usual manner, and providedwith an eye,a, at one end, and screw-shank, b, at the other, to operate the brush ashelical brushes are usually worked. The

core, A, has arranged round it in the form of a helix thespring-tempered steel,\virese c, d d, e e, ff, similarly,

so far as their general disposition and hold of them by the stock,through the strands of which they pass, t'o otherhelical wire brushes,but differing therefrom in the following important respect: The wires,which may beef equal length, instead of being held midway of theirlength, so as to project equally from opposite sides of thestock, arearranged to protrude more from one side than the other,-so that twoadjacent wires Yform, the one a short and the other a long projectionfrom or on the same side of the stogk, andv reverse projectionsrespectively on the opposite sidethereoi', thereby making alternatewires to project equally, longer on .oneand` shorteron the other side ofthe core. In this way isa steady hold given to the wires by their closelapping or packing in the i central space lying between thecore andworking ends of the wires, while said wires at their` working or outerends have the necessary increased space left between them and desirableflexibility, by reason ofthe wires` alternately only protruding from thesame side of the stock to form working ends, the intermediate wires notso protruding though similarly` projecting on the opposite side of thecore.

What I claim herein asnew and useful, and desire to secure by LettersPatent, isf A helical wire brush, in which the wires are arranged toprotrude unequally from opposite sides of the core or stock,substantially as shown and described.

ROBERT KING.

Witnesses:

HENRY T. BROWN, LW. Comms.

